The behavior exhibited by those insufferable cryptobros (who I am not a fan of either to be clear) isn't much different than that of techbros having some of the highest paying salaries in the world with a matching ego, working on some vaporware juice package squeezer or creating incredible amounts of social discord through social media and data harvesting, or the degenerate gamblers of wallstreetbets memestocks like amc or gme, or any of the pandemic stocks that are down 75-90% right now. People spending hundreds of thousands of dollars on jpgs is not much different than people spending hundreds of thousands of dollars on bananas taped to walls at Art Basel, I could go on and on.
A lot of the smugness and resentment comes from a response to human behavior which has not been exclusive to cryptocurrencies, so I don't get the fixation on this one thing, it isn't even like cryptocurrences are some ubiquitously salient thing, you can very easily filter it out from your life and social media feeds and hear next to nothing about it.